diff --git a/changelog.d/14163.feature b/changelog.d/14163.feature
new file mode 100644
index 000000000000..5d0ae16e131b
--- /dev/null
+++ b/changelog.d/14163.feature
@@ -0,0 +1 @@
+Support for thread-specific notifications & receipts ([MSC3771](https://github.com/matrix-org/matrix-spec-proposals/pull/3771) and [MSC3773](https://github.com/matrix-org/matrix-spec-proposals/pull/3773)).
diff --git a/synapse/storage/databases/main/cache.py b/synapse/storage/databases/main/cache.py
index 0ce3156c9c1d..b47fc606c754 100644
--- a/synapse/storage/databases/main/cache.py
+++ b/synapse/storage/databases/main/cache.py
@@ -244,6 +244,7 @@ def _invalidate_caches_for_event(
             # redacted.
             self._attempt_to_invalidate_cache("get_relations_for_event", (redacts,))
             self._attempt_to_invalidate_cache("get_applicable_edit", (redacts,))
+            self._attempt_to_invalidate_cache("get_thread_id", (redacts,))
 
         if etype == EventTypes.Member:
             self._membership_stream_cache.entity_has_changed(state_key, stream_ordering)